BOUNDARY-VALUE SOLUTION TO ELECTROMAGNETIC SCATTERING BY A RECTANGULAR GROOVE IN A GROUND PLANE

The diffraction of a plane electromagnetic wave by a rectangular groove corrugated in a perfectly conducting ground plane is rigorously formulated in terms of a Fourier-type integral for two orthogonal polarizations. I successfully expand the angular spectrum of the diffracted field in a series of Bessel functions. Furthermore, the Watson transform is adopted to compute the far-zone diffracted field. Results indicate that the groove width is inversely related to the beamwidth, while the groove depth is responsible for the power distribution among the mainlobe and the sidelobes. The solution remains computationally stable for a wide range of the parameters.